Nominal size 2

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Gauge II model railway in the EFA Mobile Times Museum in Amerang im Chiemgau.
LGB steam locomotive "Stainz" in the IIm gauge on an indoor exhibition center.

The nominal size II (spoken: nominal size two) is a size for model railways standardized in the standards of European model railways (NEM) and the standards of the National Model Railroad Association (NMRA) . It is also sometimes referred to as nominal size 2 . The meter gauge with a prototype gauge of 1000 mm has a model gauge of 45 mm and is colloquially referred to as gauge IIm. The scale is 1: 22.5.

Because of the large amount of space it takes up, the nominal size II is mainly used for garden railways. Otherwise it is rarely used. The best-known manufacturers in Germany are LGB , Piko and Train Line garden railways .

Some of the vehicles offered today for the IIm gauge represent compromises in the scale of the model gauge, as they either enlarge prototypes of smaller gauges (750 mm or 760 mm prototype gauge) or reduce standard gauge vehicles.


The nominal size II is not very common due to the space it takes for a functioning system compared to smaller scales in model construction. Many model railroaders who deal with the scale 1: 22.5 are organized in clubs / associations to pursue their hobby. The best-known organization is probably the IG Spur II. Interesting is the annual general meeting in Schenklengsfeld , at which driving operations are carried out on modular systems in all gauges of nominal size II. The committed model builders manufacture most of their vehicle and system models themselves. The basis for today's widespread use of narrow-gauge railways was laid in the 1970s by the LGB company, which added a weatherproof meter-gauge railway with a model gauge of 45 mm to its production program. This track is designated in accordance with trace IIm, LGB itself and other manufacturers also use the term G Scale . The G stands for garden or large railway.

Since the early 1980s, models with a model gauge of 64 mm have also been available for standard gauge . Magnus has done pioneering work here with consistent adherence to the 1: 22.5 scale.


For nominal size II, the following model gauges are specified in the European Model Railways (NEM) standards on a scale of 1: 22.5:

Nominal size designation Model gauge Prototype gauge Use with prototype gauges
II Standard gauge 64 mm 1435 mm from 1250 mm to 1700 mm
IIm Meter gauge 45 mm 1000 mm from 850 mm to <1250 mm
IIe Narrow gauge 32 mm 0750 mm, 760 mm and 800 mm from 650 mm to <850 mm
IIi (IIf) Field railway 22.5 mm 0500 mm and 600 mm from 400 mm to <650 mm
IIp (Gn15) Park railway 16.6 mm 0381 mm from 300 mm to <400 mm

Model track width of 64 mm (track II)

Model track width of 45 mm (track IIm and Fn3)

LGB steam locomotive "Stainz" in the IIm gauge outdoors.

Several large-scale model railroad and model railroad accessories manufacturers produce matching narrow-gauge track systems for the NEM-standardized gauge IIm. However, since the resulting model gauge of 45 mm does not exactly match the respective prototype gauge in every case, there are different scales:

It is also not uncommon for model I-gauge vehicle models suitable for garden model railways, which also have a model gauge of 45 mm, to be used together on systems, albeit rarely in the same train, with IIm-gauge vehicles.

Since there is currently (as of 2009) no large-scale manufacturer of vehicle models in German-speaking countries who produce narrow-gauge railways in Gauge IIe, which for example correspond to a model gauge of 750 mm according to German or Austrian narrow-gauge railways, the corresponding vehicle models are actually produced with the wrong gauge. A typical example of this are the Stainz and U series locomotive models manufactured by LGB . In the original, these run on a prototype gauge of 760 mm. In the model, however, the locomotives correspond to a model that would run on a prototype gauge of 1,000 mm (meter gauge).

Model track width of 32 mm (track IIe)

Passenger car with gauge IIe made by the English manufacturer Mamod

In contrast to the German-speaking countries, model trains of gauge IIe are widespread in Great Britain. Here, however, this track is called differently: The expression, translated analogously into German, is narrow-gauge railways on 0-gauge tracks (on a 16 mm scale , 16 mm in the model = 1 foot in the original, 1 foot = 1 ft = 304.8 mm, corresponding to one arithmetical scale of 1: 19.05). A number of locomotives that should not be underestimated are operated with live steam . One such manufacturer is Mamod . Faller was a former manufacturer of gauge IIe toy trains in German-speaking countries .


Term nominal size II and nominal size 2

Section of a Fn3 gauge module system at the 14th Convention of American Railroad fans in Switzerland

Originally, as it is today, the nominal size is designated with the Roman number II. According to the NEM, the designation with Roman numerals is still preferred, but nominal sizes I and larger can also be designated with Arabic numerals.

Term nominal size F

The nominal size F instead of the nominal size II is of US origin. It is to be sought in such a way that the Americans have converted their scale over the model gauge of 45 mm and have given the slightly different scale its own name. From an international perspective, the designation is uniform across all current nominal sizes, even if, for example, as in nominal size 0 , different scales are used in different regions of the world. It is therefore the exception to the rule. The letter F is also used to denote the corresponding narrow-gauge railway model gauges. For example: Fn3.

Term G gauge

LGB itself and other manufacturers also use the G gauge instead of IIm gauge. This is due to the company's history and originates from the fact that the G gauge designation (company designation, company standard) does not correspond to the NEM. The nominal size IIm denotes a meter -gauge narrow-gauge railway. In gauge G, regular-gauge and narrow-gauge vehicles move on tracks with a gauge of 45 mm. The manufacturers do not stick to the scale 1: 22.5, but offer models in the range 1:24 to 1:29 for the G gauge.

Web links

Commons : Spur IIm  - collection of pictures, videos and audio files
Commons : Fn3 track  - collection of images, videos and audio files
Commons : Spur IIe  - collection of images, videos and audio files
Commons : Spur IIp (Gn15)  - Collection of images, videos and audio files

Individual evidence

  2. Norms for European Model Railways, NEM 010, 2011 edition (PDF; 30 kB) Retrieved on October 10, 2012